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OCLinEcore metamodel and allinstances [message #1822272]

Mon, 02 March 2020 23:33

argaz amazig

Messages: 29
Registered: November 2018

Junior Member

I was told that using "allinstances" is not always a goud practice
why?
thanks in advance

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Re: OCLinEcore metamodel and allinstances [message #1822277 is a reply to message #1822272]

Tue, 03 March 2020 06:13

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

a) Poor implementations may implement allInstances as a search of all objects every time.

Eclipse OCL searches all objects on the first occurrence of each target type and caches.

Eclipse QVTd has a better view of the intent and searches all objects as it loads them.

b) it is often more readable to relocate the code as a Constraint on the allInstanced type.

Regards

Ed Willink

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